[openstack-community] [neutron] Adding support for elliptic curve in DH groups for key agreement protocol

Hi everyone, I was looking at neutron VPN implementation and found out that the current neutron implementation supports only creating VPN using DH up to group 15. For example, strongswan drivers support except regular group also Elliptic Curve Groups also NIST and Brainpool Elliptic Curve Groups. https://wiki.strongswan.org/projects/strongswan/wiki/IKEv2CipherSuites#Diffi.... I would like to know, if there is some limitation using Elliptic Curve groups for VPN or is this only an implementation issue? Thanks, Matus